Battery Vent Sealing Cap for Oxygen Backflow Prevention
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Solution Overview
Problem
Secondary batteries face safety risks due to the introduction of external oxygen during venting, which can lead to ignition or explosion, as existing venting processes fail to effectively prevent external air from entering the battery.
Innovation Solution
A vent sealing cap with a body, intake port, and opening/closing member that automatically opens and closes the connection between the intake and exhaust ports based on pressure changes, preventing reverse oxygen introduction by using a heat-contracted intake port and strategically positioned exhaust port with an alarm generation device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a venting process is implemented to discharge internal gas, then battery safety is improved by preventing overpressure, but external oxygen can enter the battery causing ignition or explosion
Solution Approach 1:
The vent sealing cap is divided into separate functional components: an intake port for gas discharge, an exhaust port for oxygen release, and an opening/closing member that selectively controls flow paths. This segmentation allows the system to discharge internal gas while preventing external oxygen from entering the battery
Solution Approach 2:
The opening/closing member dynamically changes the flow path configuration based on pressure differential. When internal pressure exceeds external pressure, the member opens to allow gas discharge; when external pressure exceeds internal pressure, the member closes to prevent oxygen ingress. This dynamic adaptation resolves the contradiction between venting and sealing
2Productivity
If the exhaust port is positioned above the intake port, then discharged gas can escape more effectively, but the structure becomes more complex
Solution Approach 1:
The exhaust port is positioned asymmetrically above the intake port rather than directly aligned. This asymmetric arrangement creates an effective gas discharge path that utilizes buoyancy and pressure differential, allowing gas to escape efficiently while keeping the structural complexity minimal
3Productivity
If the opening/closing member is made to move freely with pressure changes, then gas discharge is improved, but sealing reliability may deteriorate
Solution Approach 1:
The opening/closing member responds to pressure differential parameter changes by transitioning between open and closed states. When internal pressure exceeds external pressure by a threshold amount, the member opens to discharge gas; when the pressure differential reverses, the member closes to maintain sealing. This parameter-based control balances gas discharge efficiency with sealing reliability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The vent sealing cap effectively discharges internal gases while preventing external oxygen from re-entering, enhancing the safety of secondary batteries by preventing ignition and explosion.
Implementation Method 1
an opening/closing member provided in the hollow within the body to open or close connection between the intake port and the exhaust port while moving by a change in pressure of the intake port
Implementation Method 2
preventing reverse oxygen introduction by using a heat-contracted intake port
Data Source
AI summary
The present invention relates to a vent sealing cap for a secondary battery and a secondary battery including the same.The vent sealing cap for a secondary battery may includes a body having a hollow therein, an intake port provided on the body, an exhaust port provided above a position, at which the intake port is disposed; on the body, and an opening/closing member provided in the hollow within the body to open or close connection between the intake port and the exhaust port while moving by a change in pressure of the intake port.